CN203258513U

CN203258513U - LED (Light Emitting Diode) configuration structure of backlight module

Info

Publication number: CN203258513U
Application number: CN 201320291996
Authority: CN
Inventors: 秦博; 伍强; 谢均委
Original assignee: SICHUAN CHANGHONG PHOTOELECTRIC CO Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2013-05-24
Filing date: 2013-05-24
Publication date: 2013-10-30
Anticipated expiration: 2023-05-24

Abstract

The utility model relates to an LED (Light Emitting Diode) configuration structure of a backlight module, aiming at overcoming the technical problems in the prior art that a 3D (Three Dimensional) crosstalk phenomenon exists when a multi-faced-emergent LED is designed by a direct type backlight scanning module. The adopted technical scheme can be concluded into that the LED configuration structure of the backlight module comprises the backlight module provided with at least two LED elements, wherein each LED element is provided with at least two LED emergent faces; the emergent amounts of the at least two LED emergent faces are different and the LED elements in the backlight module are divided into at least two sub-regions; a division line of the sub-regions is vertical to a backlight scanning direction; the LED emergent face with the minimum emergent amount is used as an adjacent face of the LED elements of adjacent regions. The LED configuration structure of the backlight module disclosed by the utility model is reasonably configured, can greatly reduce the crosstalk and improve the 3D watching effect, and is suitable for an initiative shutter type 3D liquid crystal television or display.

Description

The LED arrangement of backlight module

Technical field

The utility model relates to a kind of LED arrangement of backlight module, specifically relates to a kind of LED arrangement that reduces the backlight module that 3D crosstalks for the multiaspect light extracting LED when the direct-type backlight scanning module designs.

Background technology

Along with the development of TV and related display industry, the equipment with 3D function also increases gradually, and take TV as example, TV majority has in the market possessed the 3D function.According to the difference of 3D Functional Design principle, the 3D TV mainly can be divided into active-shutter 3D TV (Active shutter glass3D) and polarization type 3D TV (Polarization3D).Active-shutter 3D TV must utilize backlight as light source because liquid crystal panel self is not luminous; And because liquid crystal material self response speed exist to postpone, if back light system is not processed, left eye can be watched the picture of right eye within the regular hour, and right eye also can be watched the picture of left eye within the regular hour, i.e. usually said crosstalking.

Because the crosstalk phenomenon in the active-shutter 3D TV is comparatively serious, scanning backlight need to be carried out and the 3D crosstalk phenomenon could be effectively reduced, guarantee the 3D effect of TV.It is less to crosstalk, and then 3D effect is better.The basic principle of crosstalking by scanning reduction 3D backlight is: carry out subregion by the LED to backlight module, and according to certain sequential Time share scanning, corresponding by certain sequential relationship with the left/right eye display of display panels, thereby realize the left/right eye signal that effective district office shows, reach and reduce the purpose that 3D crosstalks.

LCD TV can be divided into the fashionable and straight-down negative two large classes of side according to the difference of configuration state, when the shutter 3D of side entering type design of backlight module, by LGP is increased micro-structural, because lamp bar quantity and the subregion of LED-backlit system are relatively easily adjusted, therefore can effectively alleviate optical crosstalk phenomenon between each LED subregion when scanning backlight.Yet in the shutter 3D of straight-down negative backlight module, especially adopt in the situation of multiaspect light extracting LED as light emitting source the subregion of LED and the 3D display effect is had a direct impact at the arrangement position of horizontal and vertical direction.Because the complexity of direct-light type LED backlight system in optical design, the subregion of the LED of backlight module and arrangement etc. need to think better of, otherwise occur easily crosstalking, and reduce viewing effect.

The shutter 3D design of backlight module of present industry straight-down negative, when using the multiaspect light extracting LED as the backlight scheme, just the LED element has been carried out simple subregion, and it is not arranged targetedly, more do not have to consider or seldom consider the optical crosstalk between adjacent sectors, thereby the problem that display effect reduces can occur.

The utility model content

Technical problem to be solved in the utility model is to overcome the 3D crosstalk phenomenon that the multiaspect light extracting LED exists when the direct-type backlight scanning module designs in the prior art, and a kind of LED arrangement of backlight module is provided.

The technical scheme that its technical problem that solves the utility model adopts is: the LED arrangement of backlight module, comprise the backlight module with at least two LED elements, each LED element has at least two LED exiting surfaces, and have at least the amount of light of two LED exiting surfaces not identical, LED element in the backlight module is divided at least two subregions, and the line of demarcation between each subregion is vertical with scanning direction backlight, and the LED exiting surface of amount of light minimum is as the adjacent surface of the LED element of adjacent interval.

Concrete, the LED element of each subregion along scanning direction backlight for delegation or at least one row mode are arranged at least.

Preferably, each subregion links to each other with corresponding switch control unit respectively.

As the preferred version of technique scheme, each subregion links to each other with corresponding brightness adjusting unit respectively.

The beneficial effects of the utility model are: for the backlight module of multiaspect bright dipping provides the arrangement mode of a kind of rational LED, can significantly reduce and crosstalk, promote the 3D viewing effect.The utility model is applicable to the LED down straight aphototropism mode set design of active-shutter 3D LCD TV or display.

Description of drawings

Fig. 1 has 5 LED exiting surface LED component structure schematic diagrames among the utility model embodiment;

Fig. 2 is the LED arrangement schematic diagram of the utility model embodiment backlight module;

Fig. 3 is the scanning sequence figure backlight of the utility model embodiment;

Wherein, 1 and 2 all is the LED element.

The specific embodiment

Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.

The LED arrangement of the backlight module in the utility model, comprise the backlight module with at least two LED elements, each LED element has at least two LED exiting surfaces, and have at least the amount of light of two LED exiting surfaces not identical, LED element in the backlight module is divided at least two subregions, and the line of demarcation between each subregion is vertical with scanning direction backlight, the LED exiting surface of amount of light minimum is as the adjacent surface of the LED element of adjacent interval, and namely the LED exiting surface of amount of light minimum is parallel with the line of demarcation.By analyzing and measuring above-mentioned LED element amount of light different on each exiting surface, and scanning direction backlight when being combined in the 3D work pattern, the LED of each subregion is carried out optimization arrange, the optical crosstalk when reducing LCD TV and under the 3D pattern, working between adjacent sectors.

Embodiment

As shown in Figure 1, backlight module in this example has 5 LED exiting surfaces, that each LED element comprises is little, in, each power stage such as high-power, and the amount of light at least two exiting surfaces is not quite similar, the amount of light on each exiting surface can be determined by actual measurement or LED specification.In this example, the ABCD face is stationary plane, on the carrier for fixing to pcb board or other types; But all the other 5 equal bright dippings, A ₁B ₁C ₁D ₁The face amount of light is relatively maximum, long limit AA ₁BB ₁Face, CC ₁DD ₁The face amount of light equates and greater than minor face AA ₁DD ₁Face, BB ₁CC ₁The amount of light of face, namely the amount of light size of 5 LED exiting surfaces on each exiting surface is followed successively by: A ₁B ₁C ₁D ₁AA ₁BB ₁=CC ₁DD ₁AA ₁DD ₁=BB ₁CC ₁

In the design of direct-type backlight scanning module, need to be according to the backlight module performance requirement and in conjunction with the characteristic of the selected LED element of designing institute, determine the total quantity of the LED element that backlight module is required, represent the total quantity of the LED element of backlight module with M, therefore need to carry out zoning design to M LEDs element, the LED element need to be divided into the N district, N is the positive integer more than or equal to 2, and the partition arrangement direction is vertical with scanning direction backlight.

Such as Fig. 2, in the present embodiment, M is that 64, N is 4, is about to 64 LED elements such as Fig. 1 and is divided into 4 districts and describes, and each subregion is arranged according to two row, eight row modes by 16 LEDs elements and formed, and 3 lines of demarcation of 4 subregions are vertical with scanning direction backlight.Direction backlight is vertical direction, when the LED element is carried out zoning arrangement, so that the face of LED element amount of light less is as the adjacent surface of adjacent interval, thereby when the scanning backlight of carrying out vertical direction, farthest reduces the optical crosstalk of adjacent interval.Such as the LED element among Fig. 1 just with the minor face AA of amount of light minimum ₁DD ₁Face, BB ₁CC ₁Face is as the adjacent surface of adjacent interval, and namely above-mentioned two sides is parallel with the line of demarcation between the subregion.The LED element 2 of the LED element 1 of subregion 1 and subregion 2 all is the LED element such as Fig. 1 among this figure, all LED element characteristics in the backlight module are identical, and repeat to arrange with same modality, take the LED element 2 of the LED element 1 of subregion 1 and subregion 2 as example, namely so that the minor face AA of the amount of light minimum of LED element 1 ₁DD ₁The minor face BB of face and LED element 2 amount of light minimums ₁CC ₁Face is relative, can make in the scanning process backlight, and the Crosstalk that enters adjacent sectors is minimum.

In addition, each subregion links to each other with corresponding switch control unit respectively, and namely the LED element of each subregion all links to each other with the corresponding switch control unit of this subregion, strengthens the independence of each subregion.Further, the LED element of each subregion all links to each other with the corresponding brightness adjusting unit of this subregion, so that can independently control the brightness of the LED element of each subregion.

After subregion was finished, when backlight module entered scan pattern, each subregion can carry out scanning backlight according to certain sequential, and scanning sequence can be different under the factor affecting in the design of backlight module of different size and when arranging in pairs or groups LCD different etc.In this example, describe owing to be divided into 4 districts with backlight module, the corresponding passage control of each subregion is so carry out the example explanation with the scanning sequence figure backlight of Fig. 3.After the entry of backlight scan pattern, 4 passages can be lined by line scan according to the sequential relationship of Fig. 3 and take synchronizing signal as benchmark.The cycle of synchronizing signal is Ts, the T1 that sends from synchronizing signal is after the time period, passage 1 entry of backlight scan pattern, current lead-through is also lighted the LED element of the corresponding subregion 1 of this passage, in like manner, the T2 that sends from synchronizing signal is after the time period, and passage 2 current lead-through are also lighted the LED element of subregion 2; The T3 that sends from synchronizing signal is after the time period, and passage 3 current lead-through are also lighted the LED element of subregion 3; The T4 that sends from synchronizing signal is after the time period, and passage 4 current lead-through are also lighted the LED element of subregion 4.And in passage 1 entry of backlight scan pattern and when lighting the LED element of subregion 1, the LED element of the subregion 2 of passage 2 correspondences still is in and extinguishes state, the LED element of two subregions is lighted the time difference that has T=T2-T1, at this moment, the part LED element light of subregion 1 can enter the zone of subregion 2, forms optical crosstalk.Take active-shutter 3D LCD TV as example, if the current refresh frame of LCD is the left eye signal, previous frame is the right eye signal, then lights and in the time T that the LED element of subregion 2 extinguishes at the LED of subregion 1 element, because the optical crosstalk phenomenon, meeting is so that the beholder sees the right eye signal on the subregion 2.Other subregions in like manner, there are the time difference of Ta=T3-T2 in subregion 3 and subregion 2, there are the time difference of Tb=T4-T3 in subregion 4 and subregion 2.Crosstalk phenomenon will occur like this, affect viewing effect, crosstalk serious even can't find out 3D effect.After using LED arrangement mode of the present invention, because the amount of light between adjacency channel reduces, the light impact reduces each other, so with respect to traditional structural division mode, can significantly be reduced in the optical crosstalk between adjacency channel when carrying out scanning backlight, promote display quality.

In addition, the utility model does not need diffuser plate is carried out silk-screen or other specially treateds, can significantly reduce and crosstalk in the situation that does not increase Material Cost, promotes the 3D viewing effect.

Claims

1. the LED arrangement of backlight module, comprise the backlight module with at least two LED elements, each LED element has at least two LED exiting surfaces, and have at least the amount of light of two LED exiting surfaces not identical, it is characterized in that, LED element in the backlight module is divided at least two subregions, and the line of demarcation between each subregion is vertical with scanning direction backlight, the LED exiting surface of amount of light minimum is as the adjacent surface of the LED element of adjacent interval.

2. the LED arrangement of backlight module as claimed in claim 1 is characterized in that, the LED element of each subregion along scanning direction backlight for delegation or at least one row mode are arranged at least.

3. the LED arrangement of backlight module as claimed in claim 1 or 2 is characterized in that, each subregion links to each other with corresponding switch control unit respectively.

4. the LED arrangement of backlight module as claimed in claim 1 or 2 is characterized in that, each subregion links to each other with corresponding brightness adjusting unit respectively.